WinRAR works very well for multiple formats:----------------------------------------------------------------Download: http://www.win-rar.com/More Info : http://en.wikipedia.org/wiki/WinRAR

StuffIt is another good multi-format utility:------------------------------------------------------------------Download: http://my.smithmicro.com/win/stuffit.htmlMore Info: http://en.wikipedia.org/wiki/StuffIt

Theory:All of these "lossless" compression algorithms work by reducing redundancies in a file and increasing the entropy, i.e. making thefile more random thus more compact, since any symbol that ispredictable is partially or fully redundant.

Predictable symbols contain less information, and are thereforealloted fewer bits. More unexpected symbols contain more information, therefore are alloted more bits.

For example, in the English language the letters "t" and "e' are very frequent, thus do little to identify a word. They are given only1 or 2 bits in the compressed file.

The letter "z" is relatively rare, and knowing that a word containsthe letter "z" narrows the choices down considerably.This letter is given many bits.

On average, the number of bits in any given file, is drasticallyreduced (by statistics) when compared to the uncompressed =8 bits per character version.

Also the compression utilities search for frequently repeatedstrings, such as the word "the" and replace these with fewerbits. Good compression utilities build a custom symbol tablefor each document, and are therefore language and applicationindependent.

Well you can download winrar for zip to your files in windows vista.just goto your browser and type www.rarlab.com in the address bar and hit the enter key ,when the web site opens search for download of winrar..that's it.after downloading install it.....and zip the files you want ............thank you

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Win RAR *is* a compressed Zip file. The folder itself can't be compressed only the contents. So, just create a folder using any name you want to use such as *my rar zip* and drag the compressed winrar file into it.

you can use www.imgburn.com its fast free and easy to use
after downloading this programme it will give you many options to choose from including create ISO from files, just select all the files you want to turn into an ISO and create, after which youcan burn the whole ISO to cd/dvd for later use.
Please rate if ive helped
Kronoguy

If you forget the WinRAR /RAR password, This RAR password recovery
software may be your best resort. RAR Password Unlocker is proved to be a
helpful tool for users to recover forgotten RAR password. It supports
brute-force attack, brute force with mask and dictionary attack which
can restrict the search area and shorten the RAR password recovery time.